Sheet-metal form for armature-coils.



W. T HEWSU'Y.

SHEET METAL FORM FOB ARNIMURE COILS.

WILLIAM T. HENSLEY, or coNNEnsvILLE, INDIANA, AssIeNoE, DY MEsNE Assiena MENTS, To BOUND BROOK ENGINE a MEG. oo.,1A coRPoNArIoN or DELAWARE.

SHEET-METAL FORM FOB vARDLIA'I'l'RE-CQIIILS.

Specication of Letters Patent.

Application led May 11, 1912. Serial No. 696,608.

To all whom it may concern.' e

Be it known that I, WILLIAM T. HENSLEY, a citizen of the United States of America, and resident of Connersville, Fayette county, Indiana, have invented a certain new and useful'V Improvement in Sheet-Metal Forms for Armature-Coils, yof which the following is a specification.

My invention relates to the manufacture of armature coils of that particular kind in which the conductors are composed of flat strips of metal. Prior to my invention these had been made in various ways, including the use of strap metal, but the cost thereof was greater than was necessary.

`The obj ect of myinvention is, therefor, to provide a form for armature coils of such a character that these coils may be made from sheet metal, thus very materially reducing the cost of manufacture thereof, and without rendering the same any the less satisfactory in use.

To the foregoing and other usefulends my invention consists in matters hereinafter set forth and claimed.

In the accompanying drawings- Figure 1 is a plan view of a sheet metal blank formed by shearing or otherwise cutting the same from the body of sheet metal.

Fig. 2 shows said blank in position to be drawn through the device' by which the sharp corners are removed from the longitudinal edges thereof.

Fig. 3 shows the blank strip after being subjected to the treatment by which the said sharp corners arey removed.

Fig. 4: is a diagrammatic view illustrating themethod of and means by which the sharp corners are stripped or eliminated from the edges of the sheet metal blank.

Fig. 5V is a cross section on line 5-5 lin FigVl. FFig. 6 is a similarsection on line 66 in Fig. 7 shows the blank in cross section, and the device for smoothing the edges in elevation, which illustrates the manner 1n which the edges of the blank are rounded.

' Fig. 8 is a perspective of the imshed armature conductor.- I

As thus illustrated, the sheet metal blank served that the blank is composed of two parallel portionsa arranged with their edges close together throughoutthe length Patented. Sept.. 4t, i191?.

thereof, except where the slot al extends for l l a short distance from the nnion a2 between 'the two parallel portions.

The blank when thus made is substantially in the form of a flat-strip yof metal.

The device by which the sharp 'corners of the longitudinal edges .of .the blank are eliminated to round the edges of the blank may be of anysuitable character. For eX- ample, as shown in Figs. 2, t and 7 the said device consists of a pair of blocks B, formed with corresponding grooves b which, when the two blocks are placed together, form parallel passages or openings. The two parallel portions a of the blank are laid in the grooves or channels b of one of said blocks, in the manner shown Fig. 2, whereb the small ridge or portion b1 of said bloc enters the slots a1, and the other block is then placed in position, as shown in Fig. 7, and any suitable means are then employed for holding the two blocks together with the slotted portion of the blank between them. These channels or grooves in the blocks are of the desired formation-that isto say, they are made with rounded sides, and when-the blankis forcibly pulled between the` two blocks the sharp corners of the edges thereof are eliminated, with the result that the longitudinal edges of the blank are made round and smooth, as shown more clearly in Flg. 6.; it bein observed that in Fig. 5 the condltion o said edges previous to this operation is also clearly illustrated.

Any suitable means can be employed for pulling the blank through the device for eliminating or smoothing the edgeswof the blank, such, for exam le, as the tongs C shown in Fig. 4, it being observed that these have a toggle action which makes them capable-of exerting a powerful grip on the end of the blank.

This operationserves also, it will be seen to produce a vseparation of the two parallel portions of the blank, as shown in Fig. 3.

In other words, the operation produces a continuation of the slot a1 to the end of the blank. A

The dat conductor thus formed is now ready for furthertreatment, in any suitable manner, to render it Suitable for use in making the coil of an armature. Fer example,

mit

it may be bent into the shape shown in Fig., 8, by bending the two parallel portions apart, which is necessary and desirable for some types of armature.

Thus it will be seen that by my invention I make it possible to fproduce a satisfactory armature conductor rom sheet metal. Notwithstanding the sha and objectionable edges which the blank as when first taken from the body of sheet metal, the conductor is of entirely satisfactory form and character when finally completed and ready for use, as these sharp edges have become round and smooth and free from any characteristic which might render them unsuitable for use in constructing an armature.

What I claim as m invention is:

1. As an article o manufacture, a sheet metal blank for making an armature coil, said blank comprising a straight strip of sheet metal divided longitudinally midway betweenits edaexcentannne end thereof,

the division adjacent this endv being` wider and forming a slot. l

2.As an article of manufacture, a sheet metal blank for making an armature coil, said blank comprising a straight strip of I sheet metal divided longitudinally midwa .between its edges except at one end thereo 3. As an article' of manufacture, a sheet metal form for making an armature coil said form comprising a straight stri o sheet metal divided longitudinally mi way between its edges, except at one end thereof, the division adjacent this end beingwider and formn a slot, the divided portlons being rounde on their edges.

Si ed by me at Connersville, Indiana, this gtlh day of May, 1912.

WILLIAM T. HENSLEY.

Witnesses:

JAMES A. CLIFroN EARL W. Wrnnregus. 

